[thirdparty/git.git] / git.c

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <stdarg.h>
#include "git-compat-util.h"
#include "exec_cmd.h"
#include "cache.h"
#include "quote.h"

#include "builtin.h"

const char git_usage_string[] =
	"git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";

static void prepend_to_path(const char *dir, int len)
{
	const char *old_path = getenv("PATH");
	char *path;
	int path_len = len;

	if (!old_path)
		old_path = "/usr/local/bin:/usr/bin:/bin";

	path_len = len + strlen(old_path) + 1;

	path = xmalloc(path_len + 1);

	memcpy(path, dir, len);
	path[len] = ':';
	memcpy(path + len + 1, old_path, path_len - len);

	setenv("PATH", path, 1);

	free(path);
}

static int handle_options(const char*** argv, int* argc)
{
	int handled = 0;

	while (*argc > 0) {
		const char *cmd = (*argv)[0];
		if (cmd[0] != '-')
			break;

		/*
		 * For legacy reasons, the "version" and "help"
		 * commands can be written with "--" prepended
		 * to make them look like flags.
		 */
		if (!strcmp(cmd, "--help") || !strcmp(cmd, "--version"))
			break;

		/*
		 * Check remaining flags.
		 */
		if (!strncmp(cmd, "--exec-path", 11)) {
			cmd += 11;
			if (*cmd == '=')
				git_set_exec_path(cmd + 1);
			else {
				puts(git_exec_path());
				exit(0);
			}
		} else if (!strcmp(cmd, "-p") || !strcmp(cmd, "--paginate")) {
			setup_pager();
		} else if (!strcmp(cmd, "--git-dir")) {
			if (*argc < 1)
				return -1;
			setenv("GIT_DIR", (*argv)[1], 1);
			(*argv)++;
			(*argc)--;
		} else if (!strncmp(cmd, "--git-dir=", 10)) {
			setenv("GIT_DIR", cmd + 10, 1);
		} else if (!strcmp(cmd, "--bare")) {
			static char git_dir[1024];
			setenv("GIT_DIR", getcwd(git_dir, 1024), 1);
		} else {
			fprintf(stderr, "Unknown option: %s\n", cmd);
			usage(git_usage_string);
		}

		(*argv)++;
		(*argc)--;
		handled++;
	}
	return handled;
}

static const char *alias_command;
static char *alias_string;

static int git_alias_config(const char *var, const char *value)
{
	if (!strncmp(var, "alias.", 6) && !strcmp(var + 6, alias_command)) {
		alias_string = xstrdup(value);
	}
	return 0;
}

static int split_cmdline(char *cmdline, const char ***argv)
{
	int src, dst, count = 0, size = 16;
	char quoted = 0;

	*argv = malloc(sizeof(char*) * size);

	/* split alias_string */
	(*argv)[count++] = cmdline;
	for (src = dst = 0; cmdline[src];) {
		char c = cmdline[src];
		if (!quoted && isspace(c)) {
			cmdline[dst++] = 0;
			while (cmdline[++src]
					&& isspace(cmdline[src]))
				; /* skip */
			if (count >= size) {
				size += 16;
				*argv = xrealloc(*argv, sizeof(char*) * size);
			}
			(*argv)[count++] = cmdline + dst;
		} else if(!quoted && (c == '\'' || c == '"')) {
			quoted = c;
			src++;
		} else if (c == quoted) {
			quoted = 0;
			src++;
		} else {
			if (c == '\\' && quoted != '\'') {
				src++;
				c = cmdline[src];
				if (!c) {
					free(*argv);
					*argv = NULL;
					return error("cmdline ends with \\");
				}
			}
			cmdline[dst++] = c;
			src++;
		}
	}

	cmdline[dst] = 0;

	if (quoted) {
		free(*argv);
		*argv = NULL;
		return error("unclosed quote");
	}

	return count;
}

static int handle_alias(int *argcp, const char ***argv)
{
	int nongit = 0, ret = 0, saved_errno = errno;
	const char *subdir;
	int count, option_count;
	const char** new_argv;

	subdir = setup_git_directory_gently(&nongit);

	alias_command = (*argv)[0];
	git_config(git_alias_config);
	if (alias_string) {
		count = split_cmdline(alias_string, &new_argv);
		option_count = handle_options(&new_argv, &count);
		memmove(new_argv - option_count, new_argv,
				count * sizeof(char *));
		new_argv -= option_count;

		if (count < 1)
			die("empty alias for %s", alias_command);

		if (!strcmp(alias_command, new_argv[0]))
			die("recursive alias: %s", alias_command);

		trace_argv_printf(new_argv, count,
				  "trace: alias expansion: %s =>",
				  alias_command);

		new_argv = xrealloc(new_argv, sizeof(char*) *
				    (count + *argcp + 1));
		/* insert after command name */
		memcpy(new_argv + count, *argv + 1, sizeof(char*) * *argcp);
		new_argv[count+*argcp] = NULL;

		*argv = new_argv;
		*argcp += count - 1;

		ret = 1;
	}

	if (subdir)
		chdir(subdir);

	errno = saved_errno;

	return ret;
}

const char git_version_string[] = GIT_VERSION;

#define RUN_SETUP	(1<<0)
#define USE_PAGER	(1<<1)

static void handle_internal_command(int argc, const char **argv, char **envp)
{
	const char *cmd = argv[0];
	static struct cmd_struct {
		const char *cmd;
		int (*fn)(int, const char **, const char *);
		int option;
	} commands[] = {
		{ "add", cmd_add, RUN_SETUP },
		{ "apply", cmd_apply },
		{ "archive", cmd_archive },
		{ "cat-file", cmd_cat_file, RUN_SETUP },
		{ "checkout-index", cmd_checkout_index, RUN_SETUP },
		{ "check-ref-format", cmd_check_ref_format },
		{ "commit-tree", cmd_commit_tree, RUN_SETUP },
		{ "count-objects", cmd_count_objects, RUN_SETUP },
		{ "diff", cmd_diff, RUN_SETUP },
		{ "diff-files", cmd_diff_files, RUN_SETUP },
		{ "diff-index", cmd_diff_index, RUN_SETUP },
		{ "diff-stages", cmd_diff_stages, RUN_SETUP },
		{ "diff-tree", cmd_diff_tree, RUN_SETUP },
		{ "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
		{ "format-patch", cmd_format_patch, RUN_SETUP },
		{ "get-tar-commit-id", cmd_get_tar_commit_id },
		{ "grep", cmd_grep, RUN_SETUP },
		{ "help", cmd_help },
		{ "init-db", cmd_init_db },
		{ "log", cmd_log, RUN_SETUP | USE_PAGER },
		{ "ls-files", cmd_ls_files, RUN_SETUP },
		{ "ls-tree", cmd_ls_tree, RUN_SETUP },
		{ "mailinfo", cmd_mailinfo },
		{ "mailsplit", cmd_mailsplit },
		{ "mv", cmd_mv, RUN_SETUP },
		{ "name-rev", cmd_name_rev, RUN_SETUP },
		{ "pack-objects", cmd_pack_objects, RUN_SETUP },
		{ "prune", cmd_prune, RUN_SETUP },
		{ "prune-packed", cmd_prune_packed, RUN_SETUP },
		{ "push", cmd_push, RUN_SETUP },
		{ "read-tree", cmd_read_tree, RUN_SETUP },
		{ "repo-config", cmd_repo_config },
		{ "rev-list", cmd_rev_list, RUN_SETUP },
		{ "rev-parse", cmd_rev_parse, RUN_SETUP },
		{ "rm", cmd_rm, RUN_SETUP },
		{ "runstatus", cmd_runstatus, RUN_SETUP },
		{ "show-branch", cmd_show_branch, RUN_SETUP },
		{ "show", cmd_show, RUN_SETUP | USE_PAGER },
		{ "stripspace", cmd_stripspace },
		{ "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
		{ "tar-tree", cmd_tar_tree, RUN_SETUP },
		{ "unpack-objects", cmd_unpack_objects, RUN_SETUP },
		{ "update-index", cmd_update_index, RUN_SETUP },
		{ "update-ref", cmd_update_ref, RUN_SETUP },
		{ "upload-archive", cmd_upload_archive },
		{ "upload-tar", cmd_upload_tar },
		{ "version", cmd_version },
		{ "whatchanged", cmd_whatchanged, RUN_SETUP | USE_PAGER },
		{ "write-tree", cmd_write_tree, RUN_SETUP },
		{ "verify-pack", cmd_verify_pack },
	};
	int i;

	/* Turn "git cmd --help" into "git help cmd" */
	if (argc > 1 && !strcmp(argv[1], "--help")) {
		argv[1] = argv[0];
		argv[0] = cmd = "help";
	}

	for (i = 0; i < ARRAY_SIZE(commands); i++) {
		struct cmd_struct *p = commands+i;
		const char *prefix;
		if (strcmp(p->cmd, cmd))
			continue;

		prefix = NULL;
		if (p->option & RUN_SETUP)
			prefix = setup_git_directory();
		if (p->option & USE_PAGER)
			setup_pager();
		trace_argv_printf(argv, argc, "trace: built-in: git");

		exit(p->fn(argc, argv, prefix));
	}
}

int main(int argc, const char **argv, char **envp)
{
	const char *cmd = argv[0] ? argv[0] : "git-help";
	char *slash = strrchr(cmd, '/');
	const char *exec_path = NULL;
	int done_alias = 0;

	/*
	 * Take the basename of argv[0] as the command
	 * name, and the dirname as the default exec_path
	 * if it's an absolute path and we don't have
	 * anything better.
	 */
	if (slash) {
		*slash++ = 0;
		if (*cmd == '/')
			exec_path = cmd;
		cmd = slash;
	}

	/*
	 * "git-xxxx" is the same as "git xxxx", but we obviously:
	 *
	 *  - cannot take flags in between the "git" and the "xxxx".
	 *  - cannot execute it externally (since it would just do
	 *    the same thing over again)
	 *
	 * So we just directly call the internal command handler, and
	 * die if that one cannot handle it.
	 */
	if (!strncmp(cmd, "git-", 4)) {
		cmd += 4;
		argv[0] = cmd;
		handle_internal_command(argc, argv, envp);
		die("cannot handle %s internally", cmd);
	}

	/* Look for flags.. */
	argv++;
	argc--;
	handle_options(&argv, &argc);
	if (argc > 0) {
		if (!strncmp(argv[0], "--", 2))
			argv[0] += 2;
	} else {
		/* Default command: "help" */
		argv[0] = "help";
		argc = 1;
	}
	cmd = argv[0];

	/*
	 * We search for git commands in the following order:
	 *  - git_exec_path()
	 *  - the path of the "git" command if we could find it
	 *    in $0
	 *  - the regular PATH.
	 */
	if (exec_path)
		prepend_to_path(exec_path, strlen(exec_path));
	exec_path = git_exec_path();
	prepend_to_path(exec_path, strlen(exec_path));

	while (1) {
		/* See if it's an internal command */
		handle_internal_command(argc, argv, envp);

		/* .. then try the external ones */
		execv_git_cmd(argv);

		/* It could be an alias -- this works around the insanity
		 * of overriding "git log" with "git show" by having
		 * alias.log = show
		 */
		if (done_alias || !handle_alias(&argc, &argv))
			break;
		done_alias = 1;
	}

	if (errno == ENOENT)
		help_unknown_cmd(cmd);

	fprintf(stderr, "Failed to run command '%s': %s\n",
		cmd, strerror(errno));

	return 1;
}
Commit	Line	Data
8e49d503	1	#include <stdio.h>
7dbc2c04 JH	2	#include <sys/types.h>
	3	#include <sys/stat.h>
	4	#include <dirent.h>
8e49d503 AE	5	#include <unistd.h>
	6	#include <stdlib.h>
	7	#include <string.h>
	8	#include <errno.h>
	9	#include <limits.h>
	10	#include <stdarg.h>
4050c0df	11	#include "git-compat-util.h"
77cb17e9	12	#include "exec_cmd.h"
2b11e317	13	#include "cache.h"
575ba9d6	14	#include "quote.h"
8e49d503	15
70827b15	16	#include "builtin.h"
8e49d503	17
822a7d50 RJ	18	const char git_usage_string[] =
	19	"git [--version] [--exec-path[=GIT_EXEC_PATH]] [--help] COMMAND [ ARGS ]";
	20
8e49d503 AE	21	static void prepend_to_path(const char *dir, int len)
8e49d503 AE	22	{
554fe20d TH	23	const char *old_path = getenv("PATH");
554fe20d TH	24	char *path;
8e49d503 AE	25	int path_len = len;
	26
	27	if (!old_path)
7dbc2c04	28	old_path = "/usr/local/bin:/usr/bin:/bin";
8e49d503 AE	29
	30	path_len = len + strlen(old_path) + 1;
	31
2d7320d0	32	path = xmalloc(path_len + 1);
8e49d503 AE	33
	34	memcpy(path, dir, len);
	35	path[len] = ':';
	36	memcpy(path + len + 1, old_path, path_len - len);
	37
	38	setenv("PATH", path, 1);
0caea90b CC	39
0caea90b CC	40	free(path);
8e49d503 AE	41	}
8e49d503 AE	42
4ab243a9 JS	43	static int handle_options(const char*** argv, int* argc)
	44	{
	45	int handled = 0;
	46
	47	while (*argc > 0) {
	48	const char cmd = (argv)[0];
	49	if (cmd[0] != '-')
	50	break;
	51
6acbcb92 JS	52	/*
	53	* For legacy reasons, the "version" and "help"
	54	* commands can be written with "--" prepended
	55	* to make them look like flags.
	56	*/
	57	if (!strcmp(cmd, "--help") \|\| !strcmp(cmd, "--version"))
	58	break;
	59
	60	/*
	61	* Check remaining flags.
	62	*/
	63	if (!strncmp(cmd, "--exec-path", 11)) {
	64	cmd += 11;
	65	if (*cmd == '=')
	66	git_set_exec_path(cmd + 1);
	67	else {
	68	puts(git_exec_path());
	69	exit(0);
	70	}
	71	} else if (!strcmp(cmd, "-p") \|\| !strcmp(cmd, "--paginate")) {
4ab243a9	72	setup_pager();
6acbcb92 JS	73	} else if (!strcmp(cmd, "--git-dir")) {
	74	if (*argc < 1)
	75	return -1;
	76	setenv("GIT_DIR", (*argv)[1], 1);
	77	(*argv)++;
	78	(*argc)--;
	79	} else if (!strncmp(cmd, "--git-dir=", 10)) {
	80	setenv("GIT_DIR", cmd + 10, 1);
	81	} else if (!strcmp(cmd, "--bare")) {
	82	static char git_dir[1024];
	83	setenv("GIT_DIR", getcwd(git_dir, 1024), 1);
	84	} else {
	85	fprintf(stderr, "Unknown option: %s\n", cmd);
822a7d50	86	usage(git_usage_string);
6acbcb92	87	}
4ab243a9 JS	88
	89	(*argv)++;
	90	(*argc)--;
	91	handled++;
	92	}
	93	return handled;
	94	}
	95
2b11e317	96	static const char *alias_command;
96f1e58f	97	static char *alias_string;
2b11e317 JS	98
	99	static int git_alias_config(const char var, const char value)
	100	{
	101	if (!strncmp(var, "alias.", 6) && !strcmp(var + 6, alias_command)) {
9befac47	102	alias_string = xstrdup(value);
2b11e317 JS	103	}
	104	return 0;
	105	}
	106
	107	static int split_cmdline(char cmdline, const char **argv)
	108	{
	109	int src, dst, count = 0, size = 16;
	110	char quoted = 0;
	111
	112	argv = malloc(sizeof(char) * size);
	113
	114	/* split alias_string */
	115	(*argv)[count++] = cmdline;
	116	for (src = dst = 0; cmdline[src];) {
	117	char c = cmdline[src];
	118	if (!quoted && isspace(c)) {
	119	cmdline[dst++] = 0;
	120	while (cmdline[++src]
	121	&& isspace(cmdline[src]))
	122	; /* skip */
	123	if (count >= size) {
	124	size += 16;
83572c1a	125	argv = xrealloc(argv, sizeof(char) size);
2b11e317 JS	126	}
	127	(*argv)[count++] = cmdline + dst;
	128	} else if(!quoted && (c == '\'' \|\| c == '"')) {
	129	quoted = c;
	130	src++;
	131	} else if (c == quoted) {
	132	quoted = 0;
	133	src++;
	134	} else {
	135	if (c == '\\' && quoted != '\'') {
	136	src++;
	137	c = cmdline[src];
	138	if (!c) {
	139	free(*argv);
	140	*argv = NULL;
	141	return error("cmdline ends with \\");
	142	}
	143	}
	144	cmdline[dst++] = c;
	145	src++;
	146	}
	147	}
	148
	149	cmdline[dst] = 0;
	150
	151	if (quoted) {
	152	free(*argv);
	153	*argv = NULL;
	154	return error("unclosed quote");
	155	}
	156
	157	return count;
	158	}
	159
	160	static int handle_alias(int argcp, const char **argv)
	161	{
47e5c0ca	162	int nongit = 0, ret = 0, saved_errno = errno;
2b11e317	163	const char *subdir;
0347a8c7 ML	164	int count, option_count;
0347a8c7 ML	165	const char** new_argv;
2b11e317 JS	166
2b11e317 JS	167	subdir = setup_git_directory_gently(&nongit);
0347a8c7 ML	168
	169	alias_command = (*argv)[0];
	170	git_config(git_alias_config);
	171	if (alias_string) {
	172	count = split_cmdline(alias_string, &new_argv);
	173	option_count = handle_options(&new_argv, &count);
	174	memmove(new_argv - option_count, new_argv,
	175	count * sizeof(char *));
	176	new_argv -= option_count;
	177
	178	if (count < 1)
	179	die("empty alias for %s", alias_command);
	180
	181	if (!strcmp(alias_command, new_argv[0]))
	182	die("recursive alias: %s", alias_command);
	183
6ce4e61f CC	184	trace_argv_printf(new_argv, count,
	185	"trace: alias expansion: %s =>",
	186	alias_command);
575ba9d6	187
83572c1a JF	188	new_argv = xrealloc(new_argv, sizeof(char)
83572c1a JF	189	(count + *argcp + 1));
0347a8c7 ML	190	/* insert after command name */
	191	memcpy(new_argv + count, argv + 1, sizeof(char) * *argcp);
	192	new_argv[count+*argcp] = NULL;
2b11e317	193
0347a8c7 ML	194	*argv = new_argv;
0347a8c7 ML	195	*argcp += count - 1;
2b11e317	196
0347a8c7	197	ret = 1;
2b11e317 JS	198	}
	199
	200	if (subdir)
	201	chdir(subdir);
	202
47e5c0ca JS	203	errno = saved_errno;
47e5c0ca JS	204
2b11e317 JS	205	return ret;
	206	}
	207
70827b15	208	const char git_version_string[] = GIT_VERSION;
5b84f4d8	209
efffea03 JH	210	#define RUN_SETUP (1<<0)
efffea03 JH	211	#define USE_PAGER (1<<1)
a633fca0	212
9201c707	213	static void handle_internal_command(int argc, const char argv, char envp)
231af832 LT	214	{
	215	const char *cmd = argv[0];
	216	static struct cmd_struct {
	217	const char *cmd;
a633fca0	218	int (fn)(int, const char , const char );
9590b041	219	int option;
231af832	220	} commands[] = {
efffea03	221	{ "add", cmd_add, RUN_SETUP },
f754fa9c	222	{ "apply", cmd_apply },
4df096a5	223	{ "archive", cmd_archive },
efffea03 JH	224	{ "cat-file", cmd_cat_file, RUN_SETUP },
efffea03 JH	225	{ "checkout-index", cmd_checkout_index, RUN_SETUP },
0864f264	226	{ "check-ref-format", cmd_check_ref_format },
efffea03	227	{ "commit-tree", cmd_commit_tree, RUN_SETUP },
8112894d	228	{ "count-objects", cmd_count_objects, RUN_SETUP },
efffea03 JH	229	{ "diff", cmd_diff, RUN_SETUP },
	230	{ "diff-files", cmd_diff_files, RUN_SETUP },
	231	{ "diff-index", cmd_diff_index, RUN_SETUP },
	232	{ "diff-stages", cmd_diff_stages, RUN_SETUP },
	233	{ "diff-tree", cmd_diff_tree, RUN_SETUP },
	234	{ "fmt-merge-msg", cmd_fmt_merge_msg, RUN_SETUP },
	235	{ "format-patch", cmd_format_patch, RUN_SETUP },
f754fa9c	236	{ "get-tar-commit-id", cmd_get_tar_commit_id },
efffea03	237	{ "grep", cmd_grep, RUN_SETUP },
f754fa9c JH	238	{ "help", cmd_help },
f754fa9c JH	239	{ "init-db", cmd_init_db },
efffea03 JH	240	{ "log", cmd_log, RUN_SETUP \| USE_PAGER },
	241	{ "ls-files", cmd_ls_files, RUN_SETUP },
	242	{ "ls-tree", cmd_ls_tree, RUN_SETUP },
f754fa9c JH	243	{ "mailinfo", cmd_mailinfo },
f754fa9c JH	244	{ "mailsplit", cmd_mailsplit },
efffea03 JH	245	{ "mv", cmd_mv, RUN_SETUP },
	246	{ "name-rev", cmd_name_rev, RUN_SETUP },
	247	{ "pack-objects", cmd_pack_objects, RUN_SETUP },
	248	{ "prune", cmd_prune, RUN_SETUP },
	249	{ "prune-packed", cmd_prune_packed, RUN_SETUP },
102cb085	250	{ "push", cmd_push, RUN_SETUP },
efffea03	251	{ "read-tree", cmd_read_tree, RUN_SETUP },
f754fa9c	252	{ "repo-config", cmd_repo_config },
efffea03 JH	253	{ "rev-list", cmd_rev_list, RUN_SETUP },
	254	{ "rev-parse", cmd_rev_parse, RUN_SETUP },
	255	{ "rm", cmd_rm, RUN_SETUP },
c91f0d92	256	{ "runstatus", cmd_runstatus, RUN_SETUP },
efffea03 JH	257	{ "show-branch", cmd_show_branch, RUN_SETUP },
efffea03 JH	258	{ "show", cmd_show, RUN_SETUP \| USE_PAGER },
f754fa9c	259	{ "stripspace", cmd_stripspace },
efffea03 JH	260	{ "symbolic-ref", cmd_symbolic_ref, RUN_SETUP },
	261	{ "tar-tree", cmd_tar_tree, RUN_SETUP },
	262	{ "unpack-objects", cmd_unpack_objects, RUN_SETUP },
	263	{ "update-index", cmd_update_index, RUN_SETUP },
	264	{ "update-ref", cmd_update_ref, RUN_SETUP },
39345a21	265	{ "upload-archive", cmd_upload_archive },
f754fa9c JH	266	{ "upload-tar", cmd_upload_tar },
f754fa9c JH	267	{ "version", cmd_version },
efffea03 JH	268	{ "whatchanged", cmd_whatchanged, RUN_SETUP \| USE_PAGER },
efffea03 JH	269	{ "write-tree", cmd_write_tree, RUN_SETUP },
2e3ed670	270	{ "verify-pack", cmd_verify_pack },
231af832 LT	271	};
	272	int i;
	273
1cd95087 LT	274	/* Turn "git cmd --help" into "git help cmd" */
	275	if (argc > 1 && !strcmp(argv[1], "--help")) {
	276	argv[1] = argv[0];
	277	argv[0] = cmd = "help";
	278	}
	279
231af832 LT	280	for (i = 0; i < ARRAY_SIZE(commands); i++) {
231af832 LT	281	struct cmd_struct *p = commands+i;
a633fca0	282	const char *prefix;
231af832 LT	283	if (strcmp(p->cmd, cmd))
231af832 LT	284	continue;
575ba9d6	285
a633fca0	286	prefix = NULL;
efffea03	287	if (p->option & RUN_SETUP)
a633fca0	288	prefix = setup_git_directory();
9590b041 JH	289	if (p->option & USE_PAGER)
9590b041 JH	290	setup_pager();
6ce4e61f	291	trace_argv_printf(argv, argc, "trace: built-in: git");
575ba9d6	292
a633fca0	293	exit(p->fn(argc, argv, prefix));
231af832 LT	294	}
	295	}
	296
9201c707	297	int main(int argc, const char argv, char envp)
8e49d503	298	{
5b6df8e4	299	const char *cmd = argv[0] ? argv[0] : "git-help";
231af832	300	char *slash = strrchr(cmd, '/');
231af832	301	const char *exec_path = NULL;
a025463b	302	int done_alias = 0;
231af832 LT	303
	304	/*
	305	* Take the basename of argv[0] as the command
	306	* name, and the dirname as the default exec_path
	307	* if it's an absolute path and we don't have
	308	* anything better.
	309	*/
	310	if (slash) {
	311	*slash++ = 0;
	312	if (*cmd == '/')
	313	exec_path = cmd;
	314	cmd = slash;
	315	}
8e49d503	316
231af832 LT	317	/*
	318	* "git-xxxx" is the same as "git xxxx", but we obviously:
	319	*
	320	* - cannot take flags in between the "git" and the "xxxx".
	321	* - cannot execute it externally (since it would just do
	322	* the same thing over again)
	323	*
	324	* So we just directly call the internal command handler, and
	325	* die if that one cannot handle it.
	326	*/
	327	if (!strncmp(cmd, "git-", 4)) {
	328	cmd += 4;
	329	argv[0] = cmd;
	330	handle_internal_command(argc, argv, envp);
	331	die("cannot handle %s internally", cmd);
	332	}
8e49d503	333
231af832	334	/* Look for flags.. */
6acbcb92 JS	335	argv++;
	336	argc--;
	337	handle_options(&argv, &argc);
	338	if (argc > 0) {
	339	if (!strncmp(argv[0], "--", 2))
	340	argv[0] += 2;
	341	} else {
	342	/* Default command: "help" */
	343	argv[0] = "help";
	344	argc = 1;
97fc6c5f	345	}
6acbcb92	346	cmd = argv[0];
231af832 LT	347
	348	/*
	349	* We search for git commands in the following order:
	350	* - git_exec_path()
	351	* - the path of the "git" command if we could find it
	352	* in $0
	353	* - the regular PATH.
	354	*/
	355	if (exec_path)
	356	prepend_to_path(exec_path, strlen(exec_path));
77cb17e9 MO	357	exec_path = git_exec_path();
77cb17e9 MO	358	prepend_to_path(exec_path, strlen(exec_path));
8e49d503	359
a025463b JH	360	while (1) {
	361	/* See if it's an internal command */
	362	handle_internal_command(argc, argv, envp);
2b11e317	363
a025463b JH	364	/* .. then try the external ones */
a025463b JH	365	execv_git_cmd(argv);
231af832	366
a025463b JH	367	/* It could be an alias -- this works around the insanity
	368	* of overriding "git log" with "git show" by having
	369	* alias.log = show
	370	*/
	371	if (done_alias \|\| !handle_alias(&argc, &argv))
	372	break;
	373	done_alias = 1;
	374	}
10b15b86 AR	375
10b15b86 AR	376	if (errno == ENOENT)
822a7d50	377	help_unknown_cmd(cmd);
10b15b86 AR	378
10b15b86 AR	379	fprintf(stderr, "Failed to run command '%s': %s\n",
33ebb871	380	cmd, strerror(errno));
8e49d503 AE	381
	382	return 1;
	383	}